Malicious PDF — malware analysis report

Static analysis result for SHA-256 146db7e2f9a9a3ac…

MALICIOUS

PDF

79.8 KB Created: 2021-08-17 23:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 74b3d23a27adb9ef3a90ff4ec06b6a6e SHA-1: c20b6ad1ab53a9960a814df5b0859bece388e93a SHA-256: 146db7e2f9a9a3acf92ed6b0515a11235dda526cb5dc3ddf6e56e0aa2d2e694c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through a document that, when opened, presents a deceptive interface or redirects them to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oniceh.ru/uplcv?utm_term=marriage+biodata+word+format+download+in+marathi PDF link annotation
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609d95988c1bc---vezezoxozujun.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/61917654298.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e112481288---peburatukam.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/654cf261edab893e19522c2c0c2a27e3/38453530691.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/079608720a194db5564afa54bf79d4b0/molinodujafanabapegalotax.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc81169b3---derizejer.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/92155155714.pdfIn PDF document text
    • http://allasclub.com/campannas/file/rajuvevun.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cadbb3f8b---saxuzumezevokejidivexedes.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/83644728736.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1495d5ea6---vuzovevudoxa.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/3356efdeb1256927b9a91e6935e903fd/famevofi.pdfIn PDF document text
    • http://jarosi.hu/files/file/wokuvigudebexakafiki.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d19a981772fba270980804c05dc0ab0d/foketurod.pdfIn PDF document text
    • https://petikdaun.com/contents//files/34006027111.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcd1734a205---19884541021.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/taveletukomubatumudemok.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5f0260cd3ea7055e9116caca834e5b5d/poxadibosiruta.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cc6ec42cb---bajepesivalumenusifum.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/remuwosilogalufemafus.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f10245157---sixetidodawuxepazagumel.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4e5d1eecc3b7f41579bea51af6dfa3d5/vemiweruwil.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/cfed3951e594282c4f51657a87e57af2/pinakiroralezesoforeja.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/p6cfov3p3stij1v43amj57agj4/selasi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD533 16856 bytes
SHA-256: dc1c0bcdccf583e19b2113ab6e877d676cddc3373be6fea41dbce6f71983c5ca
font_01_sfnt_off000100cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 10852 bytes
SHA-256: 6c9eda0c17fb9bcc2a4e29f91542c371fc8e5542ea91a98c28de8996bfede5f3
font_02_sfnt_off0001197c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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